Holder for anchor bolts and the like



Ag. 27 1929. G, A, BENNE 1,726,286

HOLDER FOR ANCHOR BOLTS AND THE LIKE Original Filed Sept. 29, 1924Patented Aug. 27, 1929.

UITED STATES 1,726,286 PATENT ()FFICE.

GEORGE A. BENNET, O'F MONTREAL, QUEBEC, CANADA.

HOLDER FOR ANCHOR BOLTS AND THE LIKE.

Application filed September 29, 1924, Serial No. 740,663, and in Canada.June 4, 1924. Renewed January This invention relates to a device forholding anchor bolts and the like in position in concrete forms duringthe pouring and setting of concrete in such forms, and the object of theinvention is to provide an inexpensive and easily operated means bywhich anchor bolts may be accurately located in proper place and rigidlyheld during the pouring and setting of concrete around them.

A. furtherobject is to provide a device which may be readily separatedfrom the forms.

Various other objects and advantages of the invention may be ascertainedfrom the following description.

The invention consists briefly in providing a strip of metal aperturedintermediate its ends for engagement with a bolt at a point remote fromthe Wooden forms in which the bolt is'supported preparatory to thepouring of the concrete. The strip is bent to extend into contact withthe wooden forms at points adjacent the ends of the strip and is adaptedfor temporary attachment to the forms. Preferably the strip is designedto co-operate with the threads of the bolt so that the bolt may byrotation be pressed against the wooden form to tension the strip andenable the same to support the bolt rigidly. The head of the bolt ispositively positioned on the wooden form by the provision of a seatwhich may be a recess in the wooden form or a circularly apertured platesecured to the form.

In the accompanying drawings, which illustrate one embodiment of theinvention:

Fig. 1 is a vertical sectional view of a fragment of wooden form withconcrete thereon, illustrating an anchor bolt and holder in position.

Fig. 2 is a plan View of the device.

Referring more particularly to the drawings, 11 designates a wooden formupon which concrete 12 has been poured to form a beam, floor slab,machine foundation or the like. When anchor bolts or the like 1.3 are tobe embedded in the concrete their position is marked out on the woodenform. The means at present used to hold such bolts in position are moreor less haphazard and it is frequently found that after the concrete hasset that the bolts have been accidentally shifted from their properlocation or have been inclined from their proper position during pouringand setting of the concrete.

According to the present invention a holder is provided comprisingessentially a strip of metal 14 apertured intermediate its ends, asatl5-, for passage of an anchor bolt. The strip is bent transversely ateach side of the aperture and close thereto, as at 16, through angles ofsomething less than 90 so that two divergent legs 17 are provided. Atsuitable distances from the bends 16 each leg of the strip is bentoutwardly, as at 18, through angles substantially equal to those of thebends 16 so that portions 19 of the strip are substantially parallelwith the apertured portion. The extremities 20 of the strip arepreferably bent toward the plane of the central part, as clearly shown.The structure thus formed is roughly triangular, having at the apex theapertured portion and at the base the outwardly turned portions 19forming feet upon which the struc ture may stand. These foot portions 19are each provided with one or more apertures 21 of key-hole shapearranged with the large ends adjacent the central aperture. The centralaperture 15 may be threaded to co operate with the threads of the boltfor which it is adapted and which threads form thrust shoulders, or ifthe strip is thin enough may be merely a punched aperture somewhatsmaller than 'the'outside diameter of the bolt, so that co-operationwith the threads of the bolt may be obtained. On the other hand, theaperture may be larger than the outside diameter of the bolt andco-operation obtained by means of a nut or collar on the bolt forming athrust shoulder equivalent to the threads.

When the device is to be used, the position of an anchor bolt is markedout on the wooden form 11 and a seat provided for the head of the bolt,so that the head of the bolt will be accurately positioned and heldagainst displacement. This seat may be provided by making a slightdepression in the wooden form, but preferably it is provided byattaching a circularly apertured plate 22, such as an ordinar washer, ofsuitable size to the upper sur' ace of the form. This attachment may beeffected by driving a suitable number of short nails 23 into the formclose'around the plate with theirv heads overhanging the plate; or thenails may be bent over the plate. This method of seating the bolt headis preferable to that of pr viding a depression in the form, since byusing a plate of proper thickness the head of the bolt is held from theform, thus enabling the head of the bolt'to be completely concealedduring the finishing of the concrete. Also, the metal plate provides amore accurate and substantial seat. The anchor bolt 13 is now placed inposition, head downward and resting on the seat, so that the crowning ofthe head causes the same to centre itself accurately on the seat. In theembodiment illustrated the holder 14 is applied to the upper end of thebolt with its legs 17 depending and is screwed down on the bolt untilits feet 19 rest on the form. The bolt is then set in proper positionand while held in this position the feet of the holder are secured tothe form 11, preferably by driving nails24l through the outer or smallends of the openings 21 into the Wooden form. These nails may be of suchlength that they may be clinched on the underside of theform to holdthem against easy withdrawal. Thebolt is now rotated in a suitabledirection to cause its head to press downwardly on the seat. Thisrotation of the bolt causes, by reason of the co-operationeof the holderwith the bolt threads, a lifting effect on the holder which brings thesame in tension between the bolt and the fastenings 2 1, thus enablingthe holder to maintain the bolt rigidly in proper position. With aholder of proper size. a bolt will be so rigidly held that it will notbe readily or appreciably displaced by chance blows. 'After the concretehas been poured and is thoroughly set the fastenings 24 may bestraightened and the wooden form stripped away in the usual manner, butthe forms may if desired be stripped away without any preparatorystraightening of the fasteners. When the form 11 is removed it bringswith it the seat plate 22 and during the removal the fastenings 24.-draw out of the form and remain suspended from the holder. A light blowwith a hammer will sufiice to draw these fastenings into the inner orlarge ends of the openings 21, through which the heads of the fasteningswill pass, thus permitting their easy and expeditious removal withoutdamage to the concrete or to the holder. When the seat plate is removedit leaves a recess in the concrete which may be filled up in thefinishing of the surface, if such is desired, so as to completelyconceal the headof thebolt.v Obviously, the seat plates or washers maybe removed from the forms and used repeatedly. If exposure of the feet19 ofthe metal strip at the surface of the concrete is undesirable itmay be easily avoided by the use of washers between the feet and form,which. washers will come away with the form leaving recesses similar tothat left by the plate 22;. or-if desired, the plate 22 rraazse may beof a size to extend under the feet of the holder. The upturnedextremities 20 of the holder preclude the possibility of the ends of theholder projecting downwardly from the surface of the concrete due totension or to some other cause.

It is not essential that the holder itself have cooperative engagementwith the threads of the bolt, since obviously the desired tensioning maybe produced by the provision of a nut or collar on the threads of thebolt in engagement with the under surface of the holder; or, if the boltis not threaded, by the provision of a suitable collar or shoulder. Inthis latter case it will be necessaryfor the eflicient operation of theholder to replace the fixed head of the bolt with a nut which may berotated about the bolt to lift the same and produce the desiredtensioning.

The holder, when in position, obviously presents a resisting shoulder inthe concrete supplementing the head in holding the bolt againstwithdrawal.

While the device forming the subject of this invention is designedprimarily and has been described as a holder for anchor bolts, it willbe understood that it is capable of other uses. For example, it may beused as a holding or as an adjusting means for furring strips in fioors,Walls, and ceilings- While the device has been shown as embodying onlytwo legs arranged 180 apart, it will be understood that additional legsmay be provided arranged less than 180 to more rigidly support a bolt,although this effect may be best obtained by employing two or moreholders arranged at suitable angles to one another.

'While the. device has been shown and described as formed of metalstrap, it will be understoodthat other materials such as wire may beused to wholly or partly replace the strap. c

Having thus describedmy invention, what I claim is 1. Means to hold ananchor bolt in position for embedment directly in concrete or the likeprior to and during pouring of the concrete therearound comprising'astructure including an intermediate portion to be spaced from the formin which the concrete is poured, said intermediate portion presenting anopening for passage of the bolt, legs extending from said intermediateportion and permitting entrance of concrete therebet'ween to embed thebolt head, said legs having at their free ends apertures for passage offastening means to secure the structure to a form in which the concreteis to be poured.

2. An anchor bolt holder for concrete work and the like comprising, incombina tion with a concrete form and the bolt to be held, a strip ofmetal apertured intermediate ill) its ends for passage of-the bolt andadapted to co-operate with a thrust shoulder on the bolt at a pointremote from the form, said holder being shaped to engage the form atpoints spaced on opposite sides of the bolt and having key-hole slots insuch formengaging parts for the passage of fastening means to releasablysecure the holder to the form, whereby the holder may be tensioned andthe bolt compressed between the bolt shoulder and the form bymanipulation of the bolt to rigidly support the bolt.

3. An anchor bolt holder for concrete work comprising, in combinationwith a concrete form and an anchor bolt, a seat for the bolt headprovided on the form, and a holder comprising a strip of metal aperturedintermediate its ends for passage of thebolt and adapted to co-operatewith a thrust shoulder on the bolt at a point remote from the form, saidholder being shaped to engage the form at points spaced on oppositesides of the bolt and having key-hole slots in such form engaging partsfor the passage of fastening means to releasably secure the holder tothe form, whereby the holder may be tensioned between the bolt shoulderand the form and the bolt compressed between the holder and the boltseat by manipulation of the bolt.

4. An anchor bolt holder for concrete work comprising the combinationwith a concrete form and an anchor bolt, of a circularly apertured plateadapted for attachment to the form to support the bolt head and byreason of crowning on the head to position the bolt, and a holdercomprising a strip of metal including an intermediate portion aperturedand adapted for co-operation with the threads of the bolt at a pointremote from the form, legs extending from the ends of said intermediateportion to the form, feet on said legs for engagement with the form,said feet having key-hole slots arranged with their small ends remotefrom the bolt for the passage of fastening means and permitting theremoval of said fastening means through their large ends after removalof the form.

5. Means for holding anchor bolts to concreate forms comprising a deviceadapted to encircle the bolt at a point remote from the form and to haveengagement with a thrust shoulder on the bolt, said device havingopenings at points remote from the bolt for the passage of fasteningmeans to attach the device to a concrete form at points spaced from thebolt.

6. An anchor bolt holding means comprising a holding member archedintermediate its ends and having an aperture through which the threadedportion of a bolt may pass, the edge of the member defining the aperturebeing adapted to co-operate with the bolt threads, in combination with aconcrete form to which the ends of the member are rigidly secured andagainst which the head of-the bolt may press upon rotation, the saidform includinga recessed bolt head seat. i a 1 '7, An anchoring'meanscomprising the combination with a form of an anchor bolt and aholding member apertured for passage of and co-operation withthe boltthreads,'said member being releasably-at' tached' to'a concrete form,and supporting the bolt with its head against the form whereby uponrotation of the bolt the mem ber is tensioned and the bolt held rigidlyand in compression between the member and form before and during pouringof concrete in the form.

8. An anchor bolt holder comprising a strip of material aperturedintermediate its ends for passage of an anchor bolt and arched betweenits ends, whereby when supported toward its ends on a form a boltpassing through the aperture and bearing at its head end against suchform will be supported a sufiicient distance from the head to maintainthe bolt in proper positi0n,'the said strip being adapted adjacent itsends for attachment to a form and the aperture being threaded forco-operation with the threads of a bolt passing through it, whereby uponturning the bolt the strip may be tensioned to rigidly support the bolt.

9. An anchor bolt holder comprising a strip of material aperturedintermediate its ends for passage of an anchor bolt and arched betweenits ends, whereby when supported toward its ends on a form a boltpassing through the aperture and bearing at its head end against suchform will be supported a sufficient distance from the head to maintainthe bolt in proper position, the said strip being provided adjacent eachend with a key-hole slot through the small ends of which slots fasteningmeans may be passedto hold the strip to a concrete form and through thelarge ends of which the fastening means may be removed.

10. An anchor bolt holder comprising a strip of material aperturedintermediate its ends for passage of an anchor bolt and arched betweenits ends, whereby when supported toward its ends on a form a boltpassing through the aperture and bearing at its head end against suchform will be supported a sufiicient distance from the head to maintainthe bolt in proper position, the said strip being provided adjacent eachend with a key-hole slot through the small ends of which slots fasteningmeans may be passed to hold the strip to a concrete form and through thelarge ends of which the fastening means may be removed, the boltaperture of the strip being threaded for co-operation with the threadsof a bolt passing through it, whereby upon turning the bolt the stripmay be tensioned to rigidly support the bolt.

1 1.: Means to hold an anchor bolt in posiportion and permittingentrance of concrete tion" for embedment directly in concrete 01"therebetween to embed the bolt head, said the like prior to and duringpouring of the legs having at their free ends apertures for concretetherearound comprising the combipassage of fastening means to secure the.5; nation with: an anchor bolt to be held, of a structure to a form inwhich the concrete is 15 structure including an intermediate portion tobe poured. p Y to be-spa'ced from the'fiorm in which the con- In witnesswhereof, I have hereunto set crete is poured, said intermediate portionmy hand. presentingan opening for passage of the a p bolt, legsextending from said intermediate" GEORGE A. BENNET.

